Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail)

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Net Loss Per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail) (Stock Options [Member])
In Thousands, unless otherwise specified
3 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Stock Options [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares issuable upon the exercise of stock options that are anti-dilutive 336 596